Grundfos LCSE Installation And Operating Instructions Manual page 35

7.4.7 "Constant other value"
Pump variant
LCSE
VLSE
Any other value is kept constant.
Use this control mode if you want to control a value which is not
available in the "Control mode" menu. Connect a sensor
measuring the controlled value to one of the analog inputs of the
pump. The controlled value is shown in percentage of sensor
range.
Factory setting
See section
10. Technical data.
7.4.8 "Constant curve"
Pump variant
LCSE
VLSE
You can set the pump to operate according to a constant curve,
like an uncontrolled pump. See fig. 47.
The desired speed can be set in % of maximum speed in the
range from 13 to 100 %.
H
Fig. 47 "Constant curve"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section
10. Technical data.
"Constant other
value"
●
●
"Constant curve"
●
●
Q
).
7.4.9 "Proportional pressure"
This function is only available for VLSE.
Pump variant
LCSE
VLSE
The head of the pump is reduced at decreasing water demand
and increased at rising water demand. See fig. 48.
Use this control mode in systems with relatively large pressure
losses in the distribution pipes. The head of the pump increases
proportionally to the flow in the system to compensate for the
large pressure losses in the distribution pipes. You can set the
setpoint with an accuracy of 3.94 in (0.1 m). The head against a
closed valve is half the setpoint.
H
H
set
H
set
2
Fig. 48 "Proportional pressure"
Example
Factory-fitted differential-pressure sensor.
p
Fig. 49 "Proportional pressure"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section
10. Technical data.
"Proportional
pressure"
●
Q
).
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